Granted Patent
Utility
US 4,808,024 · App. 07/032,208
Method for installing a pavement underdrain
Inventor:
Jon A. Haas
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Mar 30, 1987
Inventor
Jon A. Haas
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.